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  2. 3-manifold - Wikipedia

    en.wikipedia.org/wiki/3-manifold

    The prime decomposition theorem for 3-manifolds states that every compact, orientable 3-manifold is the connected sum of a unique (up to homeomorphism) collection of prime 3-manifolds. A manifold is prime if it cannot be presented as a connected sum of more than one manifold, none of which is the sphere of the same dimension.

  3. Introduction to 3-Manifolds - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_3-Manifolds

    Familiar examples of two-dimensional manifolds include the sphere, torus, and Klein bottle; this book concentrates on three-dimensional manifolds, and on two-dimensional surfaces within them. A particular focus is a Heegaard splitting, a two-dimensional surface that partitions a 3-manifold into two handlebodies. It aims to present the main ...

  4. List of manifolds - Wikipedia

    en.wikipedia.org/wiki/List_of_manifolds

    Print/export Download as PDF; Printable version; In other projects ... For more examples see 3-manifold. 4-manifolds. Complex projective plane;

  5. Dehn surgery - Wikipedia

    en.wikipedia.org/wiki/Dehn_surgery

    In particular if the surgery coefficient is of the form /, then the surgered 3-manifold is still the 3-sphere. If M {\displaystyle M} is the 3-sphere, L {\displaystyle L} is the right-handed trefoil knot , and the surgery coefficient is + 1 {\displaystyle +1} , then the surgered 3-manifold is the Poincaré dodecahedral space .

  6. The geometry and topology of three-manifolds - Wikipedia

    en.wikipedia.org/wiki/The_geometry_and_topology...

    The geometry and topology of three-manifolds is a set of widely circulated notes for a graduate course taught at Princeton University by William Thurston from 1978 to 1980 describing his work on 3-manifolds. They were written by Thurston, assisted by students William Floyd and Steven Kerchoff. [1]

  7. Dehn's lemma - Wikipedia

    en.wikipedia.org/wiki/Dehn's_lemma

    In mathematics, Dehn's lemma asserts that a piecewise-linear map of a disk into a 3-manifold, with the map's singularity set in the disk's interior, implies the existence of another piecewise-linear map of the disk which is an embedding and is identical to the original on the boundary of the disk.

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